Menopause is the time in a woman's life when her periods (menstruation) stop. Most often, it is a natural, normal body change that most often occurs between ages 45 to 55. After menopause, a woman can no longer become pregnant.
During menopause, a woman's ovaries stop making eggs. The body produces less of the female hormones estrogen and progesterone. Lower levels of these hormones cause menopause symptoms.
Periods occur less often and eventually stop. Sometimes this happens suddenly. But most of the time, periods slowly stop over time.
Menopause is complete when you have not had a period for 1 year. This is called postmenopause. Surgical menopause takes place when surgical treatments cause a drop in estrogen. This can happen if your ovaries are removed.
Menopause can also sometimes be caused by drugs used for chemotherapy or hormone therapy (HT) for breast cancer.